Mathematics > Number Theory

Title:On Rationally Parametrized Modular Equations

Abstract: The classical theory of elliptic modular equations is reformulated and
extended, and many new rationally parametrized modular equations are
discovered. Each arises in the context of a family of elliptic curves attached
to a genus-zero congruence subgroup Gamma_0(N), as an algebraic transformation
of elliptic curve periods, which are parametrized by a Hauptmodul (function
field generator). Since the periods satisfy a Picard-Fuchs equation, which is
of hypergeometric, Heun, or more general type, the new equations can be viewed
as algebraic transformation formulas for special functions. The ones for
N=4,3,2 yield parametrized modular transformations of Ramanujan's elliptic
integrals of signatures 2,3,4. The case of signature 6 will require an
extension of the present theory, to one of modular equations for general
elliptic surfaces.